http://numa.notdot.net/map/100940
http://numa.notdot.net/map/101120
http://numa.notdot.net/map/101948

see how these dont have that enclosed tiles all around you feel? you will also notice they all have imaginative and good looking tiles

i didnt really think that rocket cliff or w/e its called was that good, it was just bitesized for the concept in my opinion (dont take offence to that please) /but/ ill show you what kinda levels i mean (brb)

i dunno what i meant, exclude that word :P

try to stick away from the mines one walls thing, it would of been more effective to put the gameplay area up higher so it cant be reached from the bottom by jumping and then put four launchpads on the side starting from the bottom

try to be more imaginative than squares and basic shapes, i find the most useful tiles for creating tilesets that are good looking are 6 2 7 and 3, they are also genreally quite fun

also if you /have/ to restrict your gameplay to an area like you did here use launchpads like i said /but/ try not too, its good you've done an open map but it still feels enclosed, all the gameplay focuses on that money little area

Amazingly simplistic.
Try using the one-way way of border blocking.
5/5